What rhymes with vortigern?
vor·ti·gern

Vortigern (; Old Welsh: Guorthigirn, Guorthegern; Welsh: Gwrtheyrn; Old English: Wyrtgeorn; Old Breton: Gurdiern, Gurthiern; Irish: Foirtchern; Latin: Vortigernus, Vertigernus, Uuertigernus, etc.), also spelled Vortiger, Vortigan, Voertigern and Vortigen, was a 5th-century warlord in Britain, known perhaps as a king of the Britons or at least connoted as such in the writings of Bede and Gildas. His existence is contested by scholars and information about him is obscure. He may have been the "superbus tyrannus" said to have invited Hengist and Horsa to aid him in fighting the Picts and the Scots, whereupon they revolted, killing his son in the process and forming the Kingdom of Kent. It is said that he took refuge in North Wales, and that his grave was in Dyfed or the Llŷn Peninsula. Gildas later denigrated Vortigern for his misjudgement and also blamed him for the loss of Britain. He is cited at the beginning of the genealogy of the early Kings of Powys.

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